David A. Wheeler scripsit:

> 1. The sequence ".," is currently interpreted as a symbol (as does
> guile!), which isn't correct for Common Lisp:

This is a gray area for Scheme anyway.  I don't have my full test suite
set up at the moment, but Guile's behavior is unusual:  given b => 312,
only Bigloo, Shoe, Dream, Scheme 7, Elk, Sizzle, Dfsch agree with Guile in
evaluating `(a .,b) as (a .,b), treating ".,b" as a symbol.  By contrast,
Racket, Gauche, MIT, Scheme48/scsh, Kawa, Chibi, SCM, Chez, STklos, KSi,
Scheme 9, BDC, Rep, Schemik, Oaklisp, FemtoLisp, Inlab, Owl Lisp return
(a . 312), the same as Common Lisp.

Chicken returns (a |.| 312).  For Vicare, Ypsilon, Mosh, and probably
the other R6RS systems, it's a syntax error; likewise for SigScheme
(which explicitly calls it a compatibility issue).  TinyScheme, XLisp,
SXM don't support quasiquote.

I'd go with the Common Lisp behavior in all cases, and then have a
Guile-specific feature if you really want it.

-- 
A rabbi whose congregation doesn't want         John Cowan
to drive him out of town isn't a rabbi,         http://www.ccil.org/~cowan
and a rabbi who lets them do it                 co...@ccil.org
isn't a man.    --Jewish saying

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